Unencumbered V0.1.2: Write Cucumber step definitions in D

[Atila Neves via Digitalmars-d-announce]

On Friday, 25 April 2014 at 08:45:20 UTC, Atila Neves wrote:
> On Thursday, 24 April 2014 at 18:53:22 UTC, Jacob Carlborg 
> wrote:
>> On 2014-04-23 15:24, Atila Neves wrote:
>>> Like testing with Cucumber? Wish you could call native D code 
>>> with it?
>>> Now you can!
>>>
>>> http://code.dlang.org/packages/unencumbered
>>> https://github.com/atilaneves/unencumbered
>>>
>>> I especially like registering functions that take the 
>>> parameters with
>>> the types they need from the regexp captures, as well as the
>>> compile-time failures that come from that if done incorrectly.
>>>
>>> Now I just need to use in "real life".
>>
>> BTW, why is the description passed as a template argument to 
>> the Cucumber keywords. @Given!("foo") instead of @Given("foo")?
>
> Ehm... because until now I didn't know that @Given("foo") was 
> possible. In my head I was doing compile-time stuff so 
> everything had to be compile-time, if that makes any sense.
>
> After I read the above I wasn't even sure how @Given("foo") 
> would work so I wrote some code and now know that all I need is 
> a struct with a regular string field. I think the documenation 
> on http://dlang.org/attribute.html is severely lacking.
>
> I think I have some refactoring to do now. Thanks for pointing 
> this out!
>
>
> Atila

Hmm. So for the string argument is fine, unfortunately I also 
need to know the line number of the step definition, and that 
doesn't work:

struct Given {
     this(string s, ulong l = __LINE__) {
         this.s = s;
         this.l = l;
     }
     string s;
     ulong l;
}


@Given("foobar")
auto func() pure nothrow @safe {

}

void main() {
     foreach(attr; __traits(getAttributes, func)) {
         pragma(msg, "s is ", __traits(getMember, attr, "l"));
     }
}


I get:

s is attr_str.d(21): Error: variable attr cannot be read at 
compile time
attr_str.d(21):        while evaluating pragma(msg, 
__traits(getMember, attr, "l"))